﻿#region Disclaimer / License
// Copyright (C) 2019, The Duplicati Team
// http://www.duplicati.com, info@duplicati.com
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
// 
#endregion
using Microsoft.Win32;

namespace Duplicati.Library.Utility
{
    public static class RegistryUtility
    {
        public static string GetDataByValueName(string parentKeyName, string name)
        {
            try
            {
                // check currentUser first, if null, then check LocalMachine
                // if a registry item does not exist a null is returned
                var cuParentKey = Registry.CurrentUser.OpenSubKey(parentKeyName, RegistryKeyPermissionCheck.ReadSubTree);
                if (cuParentKey?.GetValue(name) != null)
                {
                    return cuParentKey.GetValue(name).ToString();
                }

                var lmParentKey = Registry.LocalMachine.OpenSubKey(parentKeyName, RegistryKeyPermissionCheck.ReadSubTree);
                return lmParentKey?.GetValue(name).ToString();
            }
            catch
            {
                // NOOP
            }

            return null;
        }

    }
}
